Heat-exchanging coil



0t.3o,192s. 1,689,435

- l E. l. HElNsoHN HEAT EXCHANGING COIL Filed Jan. 26. 1925 aman,

CII

Patented Oct. 30, 1928.

y UNITED STATES i 1,689,435 PATENT oFFIcaf EDWIN I. HEINSOHN, or CLEVELAND, omo, AssrGNoE To THE GtAscoTE COMPANY,

0F EUCLID, OHIO, A CORPORATION OF OHIO.

HEAT-EXCHANGING COIL.

Application `1ed January 26, 1925. Serial No. 4,695.

This invention relates to heat exchanging apparatus and more particularly to improvements in pipe coils for use in connection th erewith.

In n'iany industries, and particularly the lood-manutacturing industries, it is desirable and practically necessary to use apparatus in which those portions that come in conact with the toed, arc coated with glass or other vitreous material that will be neutral, chemically, to the food materials that come in contact therewith. Glass-coated apparatus is noiv commonly used in Creamer-ies, ice cream factories, and other plants that manufacture mill: products and this type of apparatus also now commonly used in plants that manutac-ture such products as salad dressings, liruit Syrups and canned foods.

In some ot the apparatus, l'or the purposes speciiied, it is desirable to have a coil, for a heating or cooling` medium, submerged in the material for the purpose ost raisingr or lowering its temperature quickly, and in all efforts that have been heretofore made, of which I am aware, it has been to und impfracticable to satisfactorily coat a pipe coil with Q,lass or other vitreous i'naterial and yet retain t-he coil in its desired shape. This is due to the fact that the coating material is applied to the coil in the form of a powder which is fused and converted into an impervious coatingby heating the coil to a very high temperature.

In thus coating,` a coil or other piece ot apparatus with glass it is customary to heat itin a iturnace to a. temperature ot approXimately 18000 F., and, at this temperature, steel and other available metals are so sott that, in ell'orts that have heretofore been made to coat a. coil ot pipe with glass, the convolutions oi. the coil become badly distorted and the results have been Wholly unsatisfactory.

It is one of the objects of this invention to provide an improved form of pipe coil and method of making the same, that Will result in a product that will have the desired shape and not be distorted and Warped.

I have illustrated one 'form ot my invention in the accon'ipanyin g` drawings and in the following specification I disclose my improved method. In the drawings:

Figure l is a side elevation ot a common -l'orm of helical pipe coil;

Fig. 2 is a side elevation ot the same, on

a larger scale, with my invention applied thereto; and

Fig. 3 is an enlarged detail section on the line .3-3 of Fig'. 2.

In practising my invention I take a coil, such as that illustrated in Fig. l, and weld spacers l0 in between the convolutions, these spacers being' arranged in lines, as clearly shown in Fin'. 3, and a suliicient number ot these lines ol spacers beingl provided to support the convolutions against collapse When the coil is subsequently heated to the teInperature or" fusion of the coating. As shown in F ig. 2, there are siX lines ot the spacers l0, equally spaced about the axis ot the coil but thev number or' lines ot spacers necessary Will be detern'iined by the size oit the pipe from which the coil is made and the diameter of the coil. It is important to have each row ot spacers in axial alignment so that the Weight will be transmitted throughout the row Without. distorting any ot the convolutions, The spacers are thoroughly Welded to the convolutions, as indicated at the points ll in Fig. 3, `and it is preferable to use tubular spacers in order to have the requisite strength and at the same time have the thiclness or the metal of the spacers fairly uniform with that ol the coil.`

In coating articles' with glass or. other vitreous material it is advisable and practically essential to have the various parts that are to be coated, ol substantially uniform thickness so that all ot these parts will be brought to the fusion ten'iperature, ot the coating, in approximately the same time and, for this reason, I prefer to use tubular spacers in-v stead of solid rods.

Tfith both ends ot each spacer Welded to the outer suri'ace ot' the coil We would have a certain amount ot air trapped Within each spacer and upon bringing` the coil up to a temperature ot' 18000 F., the pressure would be greatly increased and would rise to such an amount as would result in bulging or distortion ot the spacers when they are in the sottened condition which results from heating' the metal to this high temperature. In order to relive this pressure I vent the interior oit each spacer, into one ot the convolutions ot the coil by means ol? a small opening, as indicated at l2. This opening; does not 4detrimentally atl'ect the subsequent use of the coil because, by using a single vent opening l2 for each spacer, there is no possibility of lllf) lll) short circuiting the heating or cooling medium through the spacers, from one convolution to the next.

ln order to support the coil in the :turnacc I provide short legs or supports 13 which are preferably made ot' the same material as the spacers l() and in alignment with the rows ot the latter, as shown in Fig'. 2. These supports 18 may be used tor supporting the coil on a suitable surface, in the furnace, or the coil may be suspended in the tui-'nace by means of the supports 13. i fitter the coil has been fabricated, as shown in Fig. 2, the coating material is applied to the entire surface ot the coil, the spacers lt) and the supports 13, in the usual manner ot applying this material to surfaces that are to be coated and the coil is then put into a suitable furnace and brought to the required temperature.

While l have referred7 in this specification and also in the claims, to a g ass-coated coil it will be understood that the invention not limited to coatings that come within the technical term rlass. l use the term glass-coated7 in the broader sense in which it inea-ns any of the ritreous coatings that are commonly used in apparatus of the kind referred to.

Haring thus described my invention, what I claim is I l. As a new article of manufacture, a glass coated pipe coil comprising a plurality ot convolutions formed Jfrom a single length ot pipe and having glass-coated spacers between the conyolutions and integrally united therewith.

2. As a new article of manufacture, a glasscoated pipe coil comprising a plurality ot conrolutions arranged to-orm a continuous coil and having glass-coated tubular spacers between the conrolutions and integrally united therewith.

As a new article of manufacture. a glass coated pipe coil comprising a plurality ot convolutions arranged to form a continuous passage through said coil and having glasscoated spacers between the adjacent convolutions and integrally united therewith, said Lesaas spacers being symmetrically arranged in a plurality et lines about the aXis of the coil.

' 4t. As a new article et manulacture. a glasscoated pipe coil comprising` a plurality ot convolutions arranged in series to term a continuous passage through said convolutions and having glass-coated tubular spacers between the adjacent conyolutions and integrally united therewith, said spacers being arranged in a plurality ot' lines equally spaced about the axis et the coil.

5. As a new article o' marnitacture. a glass coated pipe coil having glass-coated tubular spacers between the adjacent conyolutionsr and integrally united therewith, said spaccia being arranged in a plurality of lines equally spaced about the axis et the coil and there being` openings in the coil through which the interior et each spacer is Vented into one ot the convolutions with which it is united.

G. frs a new article et mainrlacturc, a ghisacoated pipe coil having glass-coated tubular spacers between the conif'olutions and integrally united therewith, and there being openings in the coil through which the interior or each spacer vented into one of the convolutions with which it is united.

7. As a new article ot manufacture. a glasscoated pipe coil comprising a plurality ot convolution spirally arranged in series to provide a continuous passage therethrough and haring rows et glass-coated spacers between the convolutions and integrally united therewith.y glass-coated supports on one of the end convolutions and integral therewith. and said supports being in alignment with said rows ot' spacers.

8. As a new article ot manufacture, a glasscoated pipe coil having a single continuous passage therethrough and having rows ot gl* v. ,cated tubular spacers between the convolutions and integrally united therewith. glass-coated tubular supports on one ot the end convolutions and integrally united therewith, and said supports beingl in alignment with said rows oi spacers.

In testimony whereof l atti): my signaturev 

